name: 'Prepare Release'
description: 'Prepare release branch with version bump, changelog update, and push'
inputs:
  version-change:
    description: 'Version change type: PATCH, MINOR, or MAJOR'
    required: true
  version-file:
    description: 'Path to version.txt file (e.g., ydb/apps/ydb/version.txt)'
    required: true
  changelog-file:
    description: 'Path to CHANGELOG.md file (optional, e.g., ydb/apps/ydb/CHANGELOG.md)'
    required: false
    default: ''
  branch-prefix:
    description: 'Release branch prefix (e.g., cli-release/)'
    required: true
  product-name:
    description: 'Product name for commit message (e.g., YDB CLI)'
    required: true
  version-artifact-name:
    description: 'Name for the version artifact (e.g., cli-version)'
    required: true
  version-artifact-file:
    description: 'File name inside the version artifact (e.g., cli_version.txt)'
    required: false
    default: 'version.txt'
outputs:
  branch-name:
    description: 'Name of the created release branch'
    value: ${{ steps.create-branch.outputs.branch-name }}
  new-version:
    description: 'New version number'
    value: ${{ steps.update-version.outputs.new-version }}
  release-commit-sha:
    description: 'SHA of the release commit'
    value: ${{ steps.push-branch.outputs.release-commit-sha }}
runs:
  using: 'composite'
  steps:
    - name: Read current version
      id: read-version
      shell: bash
      run: |
        CURRENT_VERSION=$(cat ${{ inputs.version-file }})
        echo "current-version=$CURRENT_VERSION" >> $GITHUB_OUTPUT
        echo "Current version: $CURRENT_VERSION"
    - name: Calculate new version
      id: update-version
      shell: bash
      run: |
        CURRENT_VERSION="${{ steps.read-version.outputs.current-version }}"
        IFS='.' read -ra VERSION_PARTS <<< "$CURRENT_VERSION"
        MAJOR=${VERSION_PARTS[0]}
        MINOR=${VERSION_PARTS[1]}
        PATCH=${VERSION_PARTS[2]}
        if [ "${{ inputs.version-change }}" = "MAJOR" ]; then
          MAJOR=$((MAJOR+1))
          MINOR=0
          PATCH=0
        elif [ "${{ inputs.version-change }}" = "MINOR" ]; then
          MINOR=$((MINOR+1))
          PATCH=0
        elif [ "${{ inputs.version-change }}" = "PATCH" ]; then
          PATCH=$((PATCH+1))
        fi
        NEW_VERSION="$MAJOR.$MINOR.$PATCH"
        echo "new-version=$NEW_VERSION" >> $GITHUB_OUTPUT
        echo "New version: $NEW_VERSION"
    - name: Create release branch
      id: create-branch
      shell: bash
      run: |
        git fetch origin main
        git checkout main
        git reset --hard origin/main
        BRANCH_NAME="${{ inputs.branch-prefix }}${{ steps.update-version.outputs.new-version }}"
        git checkout -b "$BRANCH_NAME"
        echo "branch-name=$BRANCH_NAME" >> $GITHUB_OUTPUT
        echo "Created branch: $BRANCH_NAME"
    - name: Check CHANGELOG.md format
      if: ${{ inputs.changelog-file != '' }}
      shell: bash
      run: |
        FIRST_LINE=$(head -n 1 ${{ inputs.changelog-file }})
        SECOND_LINE=$(head -n 2 ${{ inputs.changelog-file }} | tail -n 1)
        THIRD_LINE=$(head -n 3 ${{ inputs.changelog-file }} | tail -n 1)
        if [[ -z "$FIRST_LINE" ]] && [[ "$SECOND_LINE" =~ ^##.*##$ ]] && [[ -z "$THIRD_LINE" ]]; then
          echo "Error: CHANGELOG has nothing new since last release"
          exit 1
        fi
    - name: Update version file
      shell: bash
      run: |
        echo "${{ steps.update-version.outputs.new-version }}" > ${{ inputs.version-file }}
        git add ${{ inputs.version-file }}
    - name: Update CHANGELOG
      if: ${{ inputs.changelog-file != '' }}
      shell: bash
      run: |
        NEW_VERSION="${{ steps.update-version.outputs.new-version }}"
        echo "" > /tmp/changelog_header.md
        echo "## $NEW_VERSION ##" >> /tmp/changelog_header.md
        echo "" >> /tmp/changelog_header.md
        cat /tmp/changelog_header.md ${{ inputs.changelog-file }} > /tmp/new_changelog.md
        mv /tmp/new_changelog.md ${{ inputs.changelog-file }}
        git add ${{ inputs.changelog-file }}
    - name: Create version file
      shell: bash
      run: |
        NEW_VERSION="${{ steps.update-version.outputs.new-version }}"
        echo "$NEW_VERSION" > ${{ inputs.version-artifact-file }}
        echo "Created ${{ inputs.version-artifact-file }} with version: $NEW_VERSION"
    - name: Upload version artifact
      uses: actions/upload-artifact@v6
      with:
        name: ${{ inputs.version-artifact-name }}
        path: ${{ inputs.version-artifact-file }}
        if-no-files-found: error
        retention-days: 1
    - name: Commit changes
      shell: bash
      run: |
        git commit -m "${{ inputs.product-name }} release ${{ steps.update-version.outputs.new-version }}"
    - name: Push branch
      id: push-branch
      shell: bash
      run: |
        git push origin "${{ steps.create-branch.outputs.branch-name }}"
        RELEASE_SHA=$(git rev-parse HEAD)
        echo "release-commit-sha=$RELEASE_SHA" >> $GITHUB_OUTPUT
        echo "Release commit SHA: $RELEASE_SHA"